The Interferon- Gamma Release Assay for Tuberculosis Infection Works Because

The interferon- gamma release assay for tuberculosis infection works because

A) the TB bacterium releases interferon- gamma.
B) the presence of interferon- gamma indicates a person is susceptible to TB infection.
C) the T cells of an infected person release more interferon- gamma than that of a non- infected person.
D) individuals who have had the TB vaccine can be identified by the amount of interferon- gamma in their blood.
E) one can perform an indirect ELISA to detect antibodies to interferon- gamma in a patient with TB.